Is natural inflation in agreement with CMB data?

F. B. M. dos Santos, G. Rodrigues, J. G. Rodrigues +2

Natural inflation is a well-motivated model for the early universe in which an inflaton potential of the pseudo-Nambu-Goldstone form, $V(\varphi )={\Lambda }^4[1+\cos (\varphi /f)]$, can naturally d…